temp = int(input())
if temp >= 30:
    print('Yes')
else:
    print('No') temp = int(input()) temp int(input()) int input() input if temp >= 30:
    print('Yes')
else:
    print('No') temp >= 30 temp 30 print('Yes') print 'Yes' print('No') print 'No' temp = int(input()) int(input()) temp
temp = int(input())
if temp >= 30:
    print('Yes')
else:
    print('No')
